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Old 2011-10-25, 07:56   #1310
delta_t
 
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Default New Nvidia GPU driver 285.62

Nvidia released a new driver, 285.62, and looks like it has CUDA 4.10. I just installed it on my computer with a GTX 460M and the current win64 mfaktc (compiled under CUDA 3.2) is working fine. I haven't tried CUDALucas yet, but I figured many CUDALucas people check this thread, so perhaps one of you can test and report in that thread?

Last fiddled with by delta_t on 2011-10-25 at 08:12
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Old 2011-10-25, 12:21   #1311
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Quote:
Originally Posted by delta_t View Post
Nvidia released a new driver, 285.62, and looks like it has CUDA 4.10. I just installed it on my computer with a GTX 460M and the current win64 mfaktc (compiled under CUDA 3.2) is working fine. I haven't tried CUDALucas yet, but I figured many CUDALucas people check this thread, so perhaps one of you can test and report in that thread?
Did you see any differences in timings?

Luigi
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Old 2011-10-25, 16:31   #1312
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Quote:
Originally Posted by delta_t View Post
Nvidia released a new driver, 285.62, and looks like it has CUDA 4.10. I just installed it on my computer with a GTX 460M and the current win64 mfaktc (compiled under CUDA 3.2) is working fine. I haven't tried CUDALucas yet, but I figured many CUDALucas people check this thread, so perhaps one of you can test and report in that thread?
I just installed the new NVIDIA drivers as well, and I have a GTS 450 running CUDALucas and everything is working fine.
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Old 2011-10-25, 18:52   #1313
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Quote:
Originally Posted by ET_ View Post
Did you see any differences in timings?

Luigi
I just installed the new driver; I noted a few timings that were on the screen before shutting down both instances of mfaktc.

After installing the new driver I waited for a couple of TFs to complete. I would say there is either no difference or maybe the new driver is taking a littler bit longer.
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Old 2011-10-25, 19:05   #1314
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Default New Driver

It's working fine for me. I can't judge about speed, because I just started doing work for Mr. P-1 in a range I'm not experienced with.
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Old 2011-10-26, 16:49   #1315
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In driver version 285.62 I noticed a slight improvement in speed compared to 267.59.
avg. rate ~ 116 M/s vs ~ 115 M/s
avg. wait ~ 2100 us vs ~ 2200 us
Version 270.61 showed a lot worse performance - I didn't bother to take readings, just uninstalled it rightaway.

System info:
GPU GTS 450
CPU i3-2100
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Old 2011-10-27, 13:28   #1316
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Quote:
Originally Posted by S45653 View Post
In driver version 285.62 I noticed a slight improvement in speed compared to 267.59.
avg. rate ~ 116 M/s vs ~ 115 M/s
avg. wait ~ 2100 us vs ~ 2200 us
Version 270.61 showed a lot worse performance - I didn't bother to take readings, just uninstalled it rightaway.

System info:
GPU GTS 450
CPU i3-2100
Unfortunately none of those are good measures of speed since they can vary depending on minor variations in sieve_primes (caused by a variety of things, including using the computer for normal light tasks while mfaktc is running). Compare time per class or time per exponent instead.
Of course with avg. wait so high maybe your sieve_primes is pinned at 200,000? In that case, this is a real speedup, but as you said, minor.
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Old 2011-10-29, 22:14   #1317
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I just downloaded and installed 285.62 and the news is not good. At least not for my config. I'm running with SievePrimes fixed so that cannot explain this variation either. I find that the new version is about 4-5% slower. I wonder if compiling with 4.10 might help.

Last fiddled with by garo on 2011-10-29 at 22:14
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Old 2011-10-29, 23:36   #1318
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Quote:
Originally Posted by garo View Post
I just downloaded and installed 285.62 and the news is not good. At least not for my config. I'm running with SievePrimes fixed so that cannot explain this variation either. I find that the new version is about 4-5% slower. I wonder if compiling with 4.10 might help.
I thought it seemed just a little slower. Should we go back to the previous version? I use the GPU only for Prime95 so any other changes don't make any difference to me. I was using 280.26 before this update.
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Old 2011-10-30, 09:08   #1319
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I was using 266.71 and 285.62 is definitely slower by 4-5%.
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Old 2011-10-30, 18:18   #1320
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I need to amend the above post

I tried setting CPU affinity again and the difference between the driver versions has dropped to less than a percent. The 4-5% difference was not correct.
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